statistics

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Suppose the number of customer complaints per day on the morning shift 6-12 noon at Doys is distributed as
# of complaints f(x)
0 .3
1 ?
2 .2
what is the value of the missing probability?

What is the average number of complaints per day on the morning shift at Doys?

What is the standard deviation of the number of complaints per day on the morning shift at Doys?
If y is the number of inexperienced staff people at Doys on the morning shift, would the values of x and y be correlated?

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